The theory which enjoys the most support is that the extra time and patience that the earlier-borns get from their parents, compared with those arriving later, gives them an advantage．

　　72．What is the passage mainly about?

　　A．IQ scores have little to do with the order of birth．

　　B．Intellectual families favor the first-born

　　C．The order of birth can have an effect on IQ

　　D．The order of birth can affect personality, achievement, and carrer．

　　73．By using Charles Darwin as an example, the author wants to prove that

　　A．eldest children are the smartest in a family

　　B．youngest children will usually become experts

　　C．first-borns are more likely to win Nobel prizes

　　D．eldest children are less likely to try something new

　　74．What do we know about the dilution theory?

　　A．Intellectual parents love the first –born better

　　B．Parents’ attention will drop with more children coming

　　C．Family resources,both emotional and physical are endless．

　　D．First-born get less care and help from their parents．

　　75．The passage is developed mainly by

　　A．offering opinion with further explanation

　　B．pointing out similarities and difference

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